Cholera is the classic example of a(n)
A.
food borne illness.
B. zoonosis.
C. opportunist.
D. very severe form of diarrhea.
D
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A sea star suffers from an infection that affects its ampullae. Due to the infection, the ampullae no longer function. What do you predict will be the effect on the sea star?
A. No noticeable effect will occur. B. The sea star will be unable to reproduce. C. The sea star will be unable to extend its tube feet. D. The sea star will be unable to store energy.
What stimulates the production of antibodies by B-cells?
a. B-cells bind to and recognize specific antigens and immediately start to produce antibodies. b. T-helper cells recognize specific antigens and signal B-cells. c. Antigens are recognized by macrophages as nonself, and macrophages signal B-cells. d. Antibodies are produced any time an antigen enters the body.
Both rods and cones have four segments, each of which has a specialized function
Indicate whether the statement is true or false.
Endometriosis can lead to infertility by ____
a. preventing oocytes from forming b. preventing maturation of oocytes c. causing the formation of cysts d. causing scarring in the oviducts e. decreasing sperm viability